Welcome and enjoy!
You have found the right place if you are interested in optimizing bands. Today's modern elastic is much better than the stuff from decades gone by. If you search around here you will find reviews of many brands, widths, tapers, etc..
You will probably find that draw weight doesn't have to be all that high. All latex has a maximum retraction rate and the trick is to find the band thickness and taper that are matched to the ammo size (weight) so that you get the best possible velocity without drawing extra weight needlessly. Obviously the heavier the ball the bigger the band and the higher the draw weight, but overall draw weight is not a good indicator or power. Also great if you bigger and have a longer draw length as that will increase velocity.
There is already some good advice above about optimizing the active length of bands, and tons more of good info here on getting to that sweet spot for band thickness, taper, and active length to get the maximum speed possible into the ball without pulling extra weight that doesn't do any extra work.